Well Charlie emailed me back and to be honest I was a little surprised. He said he had done very detailed testing on it, he could not give the details of the numbers because he was doing an article for the AAOM, but was kind of enough to give me a summery.
The plenum (as a whole) had large fluxes of N, P, Si. From elevated levels to high levels. Nitrate was about the same as natural seawater. Ammonia was always much higher than natural seawater. The
biggest thing I saw was that this closed system tended to accumulate
organic nitrogen and had higher than normal levels (2-3X).
